CVE-2026-82640Public exploitHinoki check available

API key disclosure via cleartext configuration files

Published Aug 30, 2026 · Updated Aug 30, 2026

Cleartext storage in Browser Use Web UI 2.0.0 through 3.0.0 allows local users to recover LLM API keys from temporary JSON files. The save_config function in src/webui/webui_manager.py passes agent_settings.llm_api_key unchanged to json.dump and creates timestamp-named files without encryption or restrictive permissions. Exploitation requires read access to the temporary settings directory and exposes provider credentials only; no application-data modification or service interruption is reported.

CVSS severity6.8
Medium
EPSS probability0.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Cleartext storage in Browser Use Web UI 2.0.0 through 3.0.0 allows local users to recover LLM API keys from temporary JSON files. The save_config function in src/webui/webui_manager.py passes agent_settings.llm_api_key unchanged to json.dump and creates timestamp-named files without encryption or restrictive permissions. Exploitation requires read access to the temporary settings directory and exposes provider credentials only; no application-data modification or service interruption is reported.

The record

CVE
CVE-2026-82640
Published
Aug 30, 2026
Updated
Aug 30, 2026
Vendor
Browser Use
Product
Browser Use Web UI
Classifications
CWE-312, T1552.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.0 <=3.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Browser Use · Browser Use Web UIversion=2.0.0 <=3.0.0

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
T1552.001Credentials In Files

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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